Hey. Any help would be greatly appreciated. I own a 1999 chevy camaro v6. I am doing a flush and fill on my cooling system because I bought the vehicle used from the original first owner, who bought it new. It looks like he had never done a flush and fill on the cooling system. The car has 130,000 miles on it. I want to backflush the system to clean out the heating core. My question is this, which of the two lines coming from the firewall is the line to use for the backflush. To me the top line looks like it goes into the engine block, and the bottom line looks like it goes to the water pump. I think this is correct but the lines are one above and one below each other. Should I be using the top line, which I think is going to the engine block. Like I said earlier, any help would be greatly appreciated. Thank you.

 

I think its the top line ,I got to say I found with my 95 that no matter how much I flushed the system over time deposites at the bottom ,are allways there .but I would change it each year from now on,with mine I had flushed it 2 times bye a pro then once myself even did the garden hose thing in a sandy area with no pets around ,an in 2 months black again , so yes just change it once a year after your flush ,I also found it seemed to just stir up even more gunk. I was going to replace my radiator an heater core ,if your good at that they can be had for like a bit over $100.00 the plastic kind

 

coolant flows from the block to the water pump. should be a restrictor on the hose that flows out.

 

yes the kits they have have directions on them to flush out the whole system walmart like 12.00 or less ,takeing those hoses off can be a challenge after years of being on there ,I know I did a heater core an it took me longer to get the hoses off then back on

 

Thank you for the responses. Much appreciated.
I was able to completely flush the system, but now I have several new problems since I did that. I put in new coolant, put in a new thermostat(which I found out that it didnt have one in it), and bled the system. After doing that the check gauges, abs, and check engine lights all came on, plus the battery level indicator dropped completely down, and when I put the car in gear to drive it, the car stalled and wouldn't restart, but the car didnt overheat and maintained a constant temperature level. I have no idea what is wrong now. Any help would again be appreciated. Thank you.

 

sounds like something got unhooked during the process. better go around and check all wires around where you were working. have it scanned for trouble codes. should give you an idea where to look.

 

I got to say after my flush my car was not the same either ,it was said in another thread ,that is if there is to much gunk in there it can couse overheating leading to things like blown head gasket ,tracking mine back 3 flushs over 2 years it was to gunked probley should have changed my whole water system,thats was for me,for you sounds like what was said above an more ,an when my water leval light came on it was to late I had overheated it to many times ,not that noticeable but that light water leval comes on keep an eye on it